
*{
    margin: 0;
    padding: 0;
}
li{
    list-style: none;
}
div{
    width: 990px;
    height: 311px;
    margin:0 auto;
    position: relative;
}
div>ul>li{
    position: absolute;
}
div>span{
    width: 50px;
    height: 50px;
    line-height: 50px;
    position: absolute;
    text-align: center;
    background-color: aqua;
}
.zuo{
    top: 45%;
    left: 0;
}
.you{
    top: 45%;
    right: 0;
}
ol{
    position: absolute;
    bottom: 20px;
    right: 20px;
}
ol>li{
    width: 10px;
    height: 10px;
    margin: 0 5px;
    border-radius: 50%;
    border: 1px solid darkgray;
    background-color: white;
    float: left;
}
